Patent US3606761A successfully refreshed from Google Patents.
Patent US4291255A successfully refreshed from Google Patents.
Patent US2643934A successfully refreshed from Google Patents.
US2643934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized bleached polyacrylonitrile articles
Assignee: EIDP Inc
•
Filing: 1949-12-23
•
Granted: 1953-06-30
•
Expires: 1969-12-23
Abstract
No abstract record available.
Inventors
- 👤 Scheiderbauer Robert Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:17
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/23; Y; Y10; Y10S; Y10S8/00; Y10S8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR STABILIZING A POLYACRYLONITRILE ARTICLE AGAINST DISCOLORATION BY LIGHT WHICH COMPRISES BLEACHING THE SAID ARTICLE WITH A BLEACHING AGENT CONTAINING AVAILABLE CHLORIDE; IMPREGNATING THE RESULTANT BLEACHED ARTICLE WITH A PHOSPHOROUS ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYPOPHOSPHORUS ACID AND ORGANIC PHOSPHITES; AND HEATING THE RESULTANT IMPREGNATED ARTICLE.
Claim 2
Dependent Claim
51 words
A PROCESS FOR STABILIZING A POLYACRYLONITRILE ARTICLE AGAINST DISCOLORATION BY LIGHT WHICH COMPRISES BLEACHING THE SAID ARTICLE WITH A BLEACHING AGENT CONTAINING AVAILABLE CHLORIDE; IMPREGNATING THE RESULTANT BLEACHED ARTICLE WITH A PHOSPHOROUS ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYPOPHOSPHORUS ACID AND ORGANIC PHOSPHITES; AND HEATING THE RESULTANT IMPREGNATED ARTICLE.
References Cited (Backward Citations)
US2516980A
Cited
US1976359A
Cited
US2432447A
Cited
US2493597A
Cited
US2510777A
Cited
US2493390A
Cited
US2456216A
Cited
US2456231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |